Open AccessResearch into the dynamics of radio telescope foundationsusing laser vibration measuring equipment
Author(s) -
V. I. Sobolev,
Tatia. Chernigovskaya
Publication year - 2020
Publication title -
izvestiâ vuzov. investicii, stroitelʹstvo, nedvižimostʹ/izvestiâ vuzov. investicii. stroitelʹstvo. nedvižimostʹ
Language(s) - English
Resource type - Journals
eISSN - 2500-154X
pISSN - 2227-2917
DOI - 10.21285/2227-2917-2020-3-420-427
Subject(s) - vibration , laser doppler vibrometer , natural frequency , telescope , computer science , acoustics , foundation (evidence) , laser , structural engineering , engineering , physics , optics , archaeology , distributed feedback laser , history
This study presents a technology for determining the dynamic parameters of the foundation structures of radio telescopes by a non-contact method based on the use of laser vibration measuring equipment. The main results of a dynamic process analysis are described. The research was carried out in the form of microdynamic tests of foundation structures with the determination of natural oscillation periods based on lower vibrational forms. Measurements of natural vibrations of radio telescope foundations under applied shock were performed, followed by spectral mapping of vibrational processes. The tests were carried out using a tachometric laser vibrometer RSV-150 included in the register of vibration measuring equipment in Russia. Spectral mappings were obtained using Fourier transforms implemented in software packages of the hardware developers. The dynamic features of radio tele-scope foundations are formalized in the form of spectral maps of the initial records of vibrational proc-esses. The method of microdynamic tests using a vibration meter is presented, along with the principles of its operation and the sequence of numerical processing of records of dynamic processes imple-mented on a personal computer using frequency displays of natural vibrations of structures. The values of natural vibration frequencies obtained as a result of measurements confirmed the rigidity and integ-rity of foundation piles. Pronounced solitary peaks of natural vibration frequencies point to the form of natural vibrations of structures as single-mass systems with the absence of deformational forms of vi-brations in the foundation body.